rpcbufferedget.h

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/* -*- c++ -*- */
/*
 * Copyright 2015 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef RPCBUFFEREDGET_H
#define RPCBUFFEREDGET_H

#include <boost/thread/condition_variable.hpp>
#include <boost/thread/mutex.hpp>

template <typename TdataType>
class rpcbufferedget
{
public:
    rpcbufferedget(const unsigned int init_buffer_size = 4096)
        : d_data_needed(false),
          d_data_ready(),
          d_buffer_lock(),
          d_buffer(init_buffer_size)
    {
        ;
    }

    ~rpcbufferedget() { d_data_ready.notify_all(); }

    void offer_data(const TdataType& data)
    {
        if (!d_data_needed)
            return;
        {
            boost::mutex::scoped_lock lock(d_buffer_lock);
            d_buffer = data;
            d_data_needed = false;
        }
        d_data_ready.notify_one();
    }

    TdataType get()
    {
        boost::mutex::scoped_lock lock(d_buffer_lock);
        d_data_needed = true;
        d_data_ready.wait(lock);
        return d_buffer;
    }

private:
    bool d_data_needed;
    boost::condition_variable d_data_ready;
    boost::mutex d_buffer_lock;
    TdataType d_buffer;
};

#endif